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outboard motor gas tanks? #6123234
01/13/18 03:19 AM
01/13/18 03:19 AM
Joined: Dec 2006
Posts: 1,546
minn
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fossil2 Offline OP
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minn
local marine dealer told me that all the new gas tanks have a cap that functions similar to the ones on all the gas jugs that everyone hates, and that don't work well. seems theyre meant to let air in, to allow gas flow, but dont let any air out. I have one of these, and the tank will blow up like a basketball with the vent screwed all the way open. ive heard these can malfunction, and restrict the gas flow to the engine, and allow moisture to get into the tank. does anyone have any experience with these, or knowledge of them? thanks.

Re: outboard motor gas tanks? [Re: fossil2] #6123288
01/13/18 07:46 AM
01/13/18 07:46 AM
Joined: Dec 2008
Posts: 1,657
lincoln co mo
jonesy Offline
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lincoln co mo
mine does the same thing

Re: outboard motor gas tanks? [Re: fossil2] #6123312
01/13/18 08:24 AM
01/13/18 08:24 AM
Joined: Dec 2015
Posts: 266
Northern MN
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GoneTrappin Offline
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Northern MN
buy a different cap that has a manual screw vent and just leave it open. I have one of the newer plastic tanks and bought a cap that's for the old snapper rear engine rider lawn mowers, fits perfect. But I still use the old metal tanks cause I like them better

Re: outboard motor gas tanks? [Re: fossil2] #6123328
01/13/18 08:58 AM
01/13/18 08:58 AM
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Posts: 507
Ky
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WHSKR Offline
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Ky
They are junk , some Obama EPA good for the environment junk. Scan yard sales flea markets for an older good one and retrofit the connectors to your engines hook up.

Re: outboard motor gas tanks? [Re: fossil2] #6123374
01/13/18 09:59 AM
01/13/18 09:59 AM
Joined: Feb 2014
Posts: 690
E. Oregon
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super cub Offline
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E. Oregon
I bought some of those gas can vents that are plastic and flip open to vent a gas jug, they do work good on the boat cans you are talking about. 2nd on the metal boat cans, they are way better

Re: outboard motor gas tanks? [Re: fossil2] #6123438
01/13/18 11:02 AM
01/13/18 11:02 AM
Joined: Jun 2007
Posts: 16,150
Tennessee
Scuba1 Offline
"color blind Kraut"
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Tennessee
One thing about those new tanks caps is that you have to disconnect the hose from the outboard when you leave the boat or that pressure can bugger up the membranes in the fuel pump.
It does not happen all that often , but I have fixed a fair few due to that issue.


Let's go Brandon

"Shall not comply" with morons who don't understand "shall not infringe."
Re: outboard motor gas tanks? [Re: Scuba1] #6123508
01/13/18 12:05 PM
01/13/18 12:05 PM
Joined: Dec 2011
Posts: 134
Mn
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mskrtman Online content
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Mn
I have some rental Merc motors, The tanks were blowing up like balloons in the hot weather, my dealer showed me how to take a small screw driver and pry the rubber bladder out from the underside of the cap, problem fixed. Simple to do takes less than a minute.

Re: outboard motor gas tanks? [Re: GoneTrappin] #6123511
01/13/18 12:08 PM
01/13/18 12:08 PM
Joined: Mar 2007
Posts: 35,129
McGrath, AK
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white17 Offline

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Originally Posted By: GoneTrappin
buy a different cap that has a manual screw vent and just leave it open. I have one of the newer plastic tanks and bought a cap that's for the old snapper rear engine rider lawn mowers, fits perfect. But I still use the old metal tanks cause I like them better



Metal cans are also a lot safer ! The plastic container can generate static and cause a fire. I know because I burned down a building from that very cause !


Mean As Nails
Re: outboard motor gas tanks? [Re: mskrtman] #6123541
01/13/18 12:44 PM
01/13/18 12:44 PM
Joined: Sep 2010
Posts: 2,779
Northern lower Michigan
Feedinggrounds Offline
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I had a plastic boat tank swell up so round it rolled right off the back of the pontoon and was dragging it by the gas line. Another cracked and leaked, I think it swelled during the day and contracted at night, finally wearing a crack in it. Government safety rules I suppose. I restored a couple old metal tanks. I recoated the insides with "Tank Renew" repainted the outsides with rustolem red. No more problems.


you're only allowed so many sunrises... I aim to see every one of them!
Re: outboard motor gas tanks? [Re: fossil2] #6123560
01/13/18 01:20 PM
01/13/18 01:20 PM
Joined: Dec 2015
Posts: 613
Northern Missouri
Northmocats Offline
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Northern Missouri
My outboard tank wouldnt vent the best, so i took a drill bit to the vent hole and opened it up a little. It had a little set screw that you open and close. I took it out and reamed the under side. Vents both ways like a champ now.

Re: outboard motor gas tanks? [Re: fossil2] #6123583
01/13/18 01:41 PM
01/13/18 01:41 PM
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Posts: 1,546
minn
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fossil2 Offline OP
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gone trappin......this cap has a manual vent screw, but only vents one way.

scuba,,,,ive heard that too,,another potential problem I'm trying to avoid.

mskrtman,,,,is this a rubber o-ring that forms a seal between tank and cap, or something else.

the plastic tank I have fits perfectly in the transom well, so id like to keep that, rather than a steel tank.

ive heard that old style caps are available online, to bypass this regulation. does anyone have any experience with these?

thanks to all for the help so far.

Re: outboard motor gas tanks? [Re: fossil2] #6123595
01/13/18 01:51 PM
01/13/18 01:51 PM
Joined: Dec 2006
Posts: 1,546
minn
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fossil2 Offline OP
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also,,,has anyone had issues with these caps letting moisture into the tank?

Re: outboard motor gas tanks? [Re: fossil2] #6123904
01/13/18 08:07 PM
01/13/18 08:07 PM
Joined: Dec 2006
Posts: 1,546
minn
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fossil2 Offline OP
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TTT........

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